Playtime: Error "not implemented" when exporting to arrangement

[helgoboss]

User reported:

I am not able to export tracks, matrix or sequences in arrangement view. The unknow error window shows up instead

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REAPER version: 7.20/x64
Module name: Helgobox
Module version: v2.16.1/x86_64 rev 59b056 (2024-08-09 10:39:55 UTC)
Module base address: 0x7ff85a950000
Module size: 0x2754000

Message: not implemented

0: 0x7ff85bfb1cdb - invoke_host
1: 0x7ff85bfaf9f2 - invoke_host
2: 0x7ff85bf20aeb - invoke_host
3: 0x7ff85c1bb0c7 - cpp_to_rust_ProjectStateContext_SetTempFlag
4: 0x7ff85c1baf19 - cpp_to_rust_ProjectStateContext_SetTempFlag
5: 0x7ff85c1b933f - cpp_to_rust_ProjectStateContext_SetTempFlag
6: 0x7ff85c1bac08 - cpp_to_rust_ProjectStateContext_SetTempFlag
7: 0x7ff85c4abb74 - cpp_to_rust_ProjectStateContext_SetTempFlag
8: 0x7ff85c4abc3d - cpp_to_rust_ProjectStateContext_SetTempFlag
9: 0x7ff85bdfce27 - invoke_host
10: 0x7ff85bd39965 - invoke_host
11: 0x7ff85bda3129 - invoke_host
12: 0x7ff85bda2cad - invoke_host
13: 0x7ff85b42ed73 - MAIN
14: 0x7ff85affce2d - NSEEL_HOSTSTUB_LeaveMutex
15: 0x7ff85b8d3d8a - invoke_host
16: 0x7ff85b46539c - invoke_host
17: 0x7ff85b20b353 - DllMain
18: 0x7ff85bf489b3 - invoke_host
19: 0x7ff85ae62cc6 - NSEEL_HOSTSTUB_LeaveMutex
20: 0x7ff85c07f2ff - cpp_to_rust_ProjectStateContext_SetTempFlag
21: 0x7ff85c061c83 - cpp_to_rust_IReaperControlSurface_Run
22: 0x140330f0b -
23: 0x14020319b -
24: 0x1402028ca -
25: 0x1402020d3 -
26: 0x1404bcea1 -
27: 0x7ff8d2913170 - ScreenToClient
28: 0x7ff8d2912912 - ScreenToClient
29: 0x7ff8d295b859 - UnpackDDElParam
30: 0x7ff8d290ef5c - CallWindowProcW
31: 0x7ff8d290e684 - DispatchMessageW
32: 0x1404b3dd0 -
33: 0x140aac661 -
34: 0x7ff8d2307374 - BaseThreadInitThunk
35: 0x7ff8d3ddcc91 - RtlUserThreadStart
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[bvavra]

Just an FYI that I also experience this issue (and have already sent an email yesterday with details). I've noticed this only impacts exporting MIDI; I can export audio clips just fine.