Solid hatch does not cover some elements even if it is pushed to top with Order about librecad HOT 5 OPEN

Sample file:
solidtest220.zip
An even more weird sample, an older file:
arch_cm_100_a4_uebung_220.zip
It shows right in normal view, but wrong in Print Preview. I couldn't reproduce this in a new drawing.
All samples behave well in LibreCAD 2.2.0. Not in 2.2.1.

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What about hatches

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For solid, we should allow setting of its alpha channel.

Or simply setting alpha=1, say, for printing.

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Alpha channel for solids - what does this mean? I know in bitmap graphics it's about transparency. Would this help for this issue? It works all right in 2.2.0 without that feature.
But anyway I would appreciate to be able to set a transparency value for a solid. It's valuable for graphical effects, for example in an architectural facade drawing, laying a shade over an already coloured surface to give a three-dimensional impression.
This would make LibreCAD an interesting tool for graphic designers as it is a pain to draw with exact dimensions in usual graphic apps like inkscape. A new area for LibreCAD to expand into.

By the way, the new Entity Info tool does not react to a solid (normal hatch works), and the solid also prevents other entities beneath it to be detected.

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It appears to me the trouble is limited to polylines.

Other primitive geometries are hidden by the solid fill, if sent to bottom

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