Surge XT in Carla Rack produces no sound after exit/reload song

[dto]

System Information

Linux Mint

LMMS Version(s)

Version 1.3.0-alpha.1.695+g01294192c (Linux/x86_64, Qt 5.15.3, GCC 11.4.0).

Most Recent Working Version

No response

Bug Summary

Using Carla Rack to host Surge XT works fine, but if I save and close, then reopen LMMS and load the song, Surge XT produces no audio output even when notes are played. The output meters in the Surge XT GUI show no movement.

Expected Behaviour

The Surge XT plugin should be properly reinstantiated and notes should play after song is reloaded.

Steps To Reproduce

1. Add Carla Rack to new song
2. Add Surge XT to Carla Rack
3. Add notes to MIDI track
4. Save song
5. Quit LMMS
6. Load song in new instance of LMMS

Logs

dto@thexder:~/src/lmms$ ./lmms
Lv2 plugin SUMMARY: 226 of 266 loaded in 127 msecs.
For details about not loaded plugins, please set
environment variable "LMMS_LV2_DEBUG" to nonempty.
Blocked Lv2 Plugins: 11 of 266
If you want to enable them (dangerous!), please set
environment variable "LMMS_ENABLE_BLOCKED_PLUGINS" to nonempty.
Connection established.

Stream successfully created

lmms::gui::TrackContentWidget(0x5621ce124ef0) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce147df0) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621cd8b99e0) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce352400) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621cde87290) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce381640) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce1f2e00) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce1343f0) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce4034f0) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621ce1507a0) does not have a property named "gridColor"
lmms::gui::TrackContentWidget(0x5621cec07240) does not have a property named "gridColor"
[carla] Plugin UI wants a feature that is not supported (ignored):
http://lv2plug.in/ns/ext/options#interface
[carla] Will use LV2 X11 UI for 'Surge XT'
[carla] Plugin requested value for 'https://surge-synthesizer.github.io/lv2/surge-xt:Program' which is not available

Screenshots / Minimum Reproducible Project

No response

Please search the issue tracker for existing bug reports before submitting your own.

• I have searched all existing issues and confirmed that this is not a duplicate.

[dto]

workaround of removing Surge XT plugin [edit: and then recreating it] restores sound. bug manifests if you clone a Carla Rack track with Surge XT in it.

[msea4ever]

I have the same issue with Lubuntu 24.10 (Oracular Oriole)
lmms-1.3.0-alpha.1.715+g1f37c9ba7-linux-x86_64.AppImage