Session changing after inbound with transfer

[TieFighter]

Every inbound call with transfer event to internal extension results on agent session change. Agent listen "Your are the only person on this conference" after call DISPO screen. The agent session doesn't change on call without transfer event.

Is it a bug or did I miss something here?

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ViciBox Server v.6 | VERSION: 2.10-451a BUILD: 140902-0816 | Asterisk 1.8.29-vici | 1 All-one Server | OpenVox d161 | No additional software | no customization | Only two agents.
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CLI debug from call with transfer:
/var/log/asterisk/messages

[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Executing [8000@entrada:1] Goto("DAHDI/4-1", "trunkinbound,8000,1") in new stack
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Goto (trunkinbound,8000,1)
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Executing [8000@trunkinbound:1] AGI("DAHDI/4-1", "agi-DID_route.agi") in new stack
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Launched AGI Script /usr/share/asterisk/agi-bin/agi-DID_route.agi
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- AGI Script Executing Application: (Monitor) Options: (wav,/var/spool/asterisk/monitor/MIX/20141107105701_8000_8533118000)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- <DAHDI/4-1>AGI Script agi-DID_route.agi completed, returning 0
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Executing [99909*3***DID@default:1] Answer("DAHDI/4-1", "") in new stack
[Nov 7 10:57:01] DEBUG[19435] chan_dahdi.c: Answering MFC/R2 call on chan 4
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Executing [99909*3***DID@default:2] AGI("DAHDI/4-1", "agi-VDAD_ALL_inbound.agi") in new stack
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Launched AGI Script /usr/share/asterisk/agi-bin/agi-VDAD_ALL_inbound.agi
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:01] VERBOSE[19435] res_agi.c: [Nov 7 10:57:01] -- <DAHDI/4-1>AGI Script agi-VDAD_ALL_inbound.agi completed, returning 0
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Executing [192*168*000*004*8600051@default:1] Goto("DAHDI/4-1", "default,8600051,1") in new stack
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Goto (default,8600051,1)
[Nov 7 10:57:01] VERBOSE[19435] pbx.c: [Nov 7 10:57:01] -- Executing [8600051@default:1] MeetMe("DAHDI/4-1", "8600051,F") in new stack
[Nov 7 10:57:11] VERBOSE[19435] pbx.c: [Nov 7 10:57:11] == Spawn extension (default, 8301, 1) exited non-zero on 'DAHDI/4-1'
[Nov 7 10:57:11] VERBOSE[19435] pbx.c: [Nov 7 10:57:11] -- Executing [8301@default:1] Answer("DAHDI/4-1", "") in new stack
[Nov 7 10:57:11] VERBOSE[19435] pbx.c: [Nov 7 10:57:11] -- Executing [8301@default:2] AGI("DAHDI/4-1", "park_CID.agi") in new stack
[Nov 7 10:57:11] VERBOSE[19435] res_agi.c: [Nov 7 10:57:11] -- Launched AGI Script /usr/share/asterisk/agi-bin/park_CID.agi
[Nov 7 10:57:11] VERBOSE[19435] res_agi.c: [Nov 7 10:57:11] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:11] VERBOSE[19435] res_agi.c: [Nov 7 10:57:11] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:11] VERBOSE[19435] res_agi.c: [Nov 7 10:57:11] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:11] VERBOSE[19435] res_agi.c: [Nov 7 10:57:11] -- Playing 'sip-silence' (escape_digits=) (sample_offset 0)
[Nov 7 10:57:11] VERBOSE[19435] res_musiconhold.c: [Nov 7 10:57:11] -- Started music on hold, class 'default', on DAHDI/4-1
[Nov 7 10:57:32] VERBOSE[19435] res_musiconhold.c: [Nov 7 10:57:32] -- Stopped music on hold on DAHDI/4-1
[Nov 7 10:57:32] VERBOSE[19435] res_agi.c: [Nov 7 10:57:32] -- <DAHDI/4-1>AGI Script park_CID.agi completed, returning 4
[Nov 7 10:57:32] VERBOSE[19435] pbx.c: [Nov 7 10:57:32] == Spawn extension (default, 8600051, 1) exited non-zero on 'DAHDI/4-1'
[Nov 7 10:57:32] VERBOSE[19435] pbx.c: [Nov 7 10:57:32] -- Executing [8600051@default:1] MeetMe("DAHDI/4-1", "8600051,F") in new stack
[Nov 7 10:57:47] DEBUG[19435] chan_dahdi.c: bits changed in chan 4
[Nov 7 10:57:47] VERBOSE[19435] chan_dahdi.c: [Nov 7 10:57:47] MFC/R2 call disconnected on channel 4
[Nov 7 10:57:47] VERBOSE[19435] chan_dahdi.c: [Nov 7 10:57:47] -- Hungup 'DAHDI/pseudo-1776690646'
[Nov 7 10:57:47] VERBOSE[19435] pbx.c: [Nov 7 10:57:47] == Spawn extension (default, 8600051, 1) exited non-zero on 'DAHDI/4-1'
[Nov 7 10:57:47] VERBOSE[19435] pbx.c: [Nov 7 10:57:47] -- Executing [h@default:1] AGI("DAHDI/4-1", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----0---------------") in new stack
[Nov 7 10:57:47] VERBOSE[19435] res_agi.c: [Nov 7 10:57:47] -- <DAHDI/4-1>AGI Script agi://127.0.0.1:4577/call_log--HVcauses ... ---------- completed, returning 0
[Nov 7 10:57:47] DEBUG[19435] chan_dahdi.c: disconnecting MFC/R2 call on chan 4
[Nov 7 10:57:47] DEBUG[19435] chan_dahdi.c: ast cause 0 resulted in openr2 cause 6/Normal Clearing
[Nov 7 10:57:47] VERBOSE[19435] chan_dahdi.c: [Nov 7 10:57:47] MFC/R2 call end on channel 4
[Nov 7 10:57:47] VERBOSE[19435] chan_dahdi.c: [Nov 7 10:57:47] -- Hungup 'DAHDI/4-1'