Fujitsu fi-7160 hangs on MSG_CLOSEDS after acquire (Twain2.X)

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DSM hangs while closing the datasource after acquiring at least 1 image only when operating on TWAIN 2.X mode.

Drivers used:
PaperStream IP fi-7160, version 1.60 x86
PaperStream IP fi-7160, version 1.60 x86_64

Test system:
Windows 10 x86_64

Tested on x86 and x86_64 application. Datasource GUI is hidden by the application.
The Application implements TWAIN specification Version 2.4.

twaindsm log:

[dsm.cpp  2382     0 0000000000004A38] TwainApp -> PaperStream IP fi-7160
[dsm.cpp  2391     0 0000000000004A38] DG_CONTROL/DAT_USERINTERFACE/MSG_ENABLEDS
[dsm.cpp  2446     0 0000000000004A38] TWRC_SUCCESS

[dsm.cpp  2382     0 0000000000004A38] PaperStream IP fi-7160 -> TwainApp
[dsm.cpp  2391     0 0000000000004A38] DG_CONTROL/DAT_NULL/MSG_XFERREADY
[dsm.cpp  2382     0 0000000000004A38]   DSM -> TwainApp
[dsm.cpp  2391     0 0000000000004A38]   DG_CONTROL/DAT_NULL/MSG_XFERREADY
[dsm.cpp  2382     0 0000000000004A38]     TwainApp -> PaperStream IP fi-7160
[dsm.cpp  2387     0 0000000000004A38]     DG_CONTROL/DAT_CAPABILITY/MSG_GET/ICAP_XFERMECH
[dsm.cpp  2446     0 0000000000004A38]     TWRC_SUCCESS TWON_ENUMERATION

[dsm.cpp  2382     0 0000000000004A38]     TwainApp -> PaperStream IP fi-7160
[dsm.cpp  2387     0 0000000000004A38]     DG_CONTROL/DAT_CAPABILITY/MSG_GETCURRENT/ICAP_XFERMECH
[dsm.cpp  2446     0 0000000000004A38]     TWRC_SUCCESS TWON_ONEVALUE 

[dsm.cpp  2382     0 0000000000004A38]     TwainApp -> PaperStream IP fi-7160
[dsm.cpp  2391     0 0000000000004A38]     DG_IMAGE/DAT_IMAGENATIVEXFER/MSG_GET
[dsm.cpp  2446     0 0000000000004A38]     TWRC_XFERDONE

[dsm.cpp  2382     0 0000000000004A38]     TwainApp -> PaperStream IP fi-7160
[dsm.cpp  2391     0 0000000000004A38]     DG_CONTROL/DAT_PENDINGXFERS/MSG_ENDXFER
[dsm.cpp  2446     0 0000000000004A38]     TWRC_SUCCESS Count = 0

[dsm.cpp  2382     0 0000000000004A38]     TwainApp -> PaperStream IP fi-7160
[dsm.cpp  2391     0 0000000000004A38]     DG_CONTROL/DAT_USERINTERFACE/MSG_DISABLEDS
[dsm.cpp  2446     0 0000000000004A38]     TWRC_SUCCESS

[dsm.cpp  2382     0 0000000000004A38]     TwainApp -> DSM
[dsm.cpp  2391     0 0000000000004A38]     DG_CONTROL/DAT_IDENTITY/MSG_CLOSEDS

MSG_CLOSEDS works fine when using the legacy twain 1.X mode.

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