TomoTwin crashes when trying to save filament layer

[thorstenwagner]

Observed with tomos (but it probably also happens for micrographs):

This only happens if you first create the filament layer, add a filament and then apply a low pass filter. If you first low pass filter it and then create the filament layer it works.

[thorstenwagner]

@mstabrin I think I need your help for that issue. I couldnt figure out what is happening and I'm not yet fully understand the linking in case of low pass filtering,