Thank you. On second thought… I think deeper investigation isn’t worth it unless it gets significantly worse or gets reproduced on recent Turris OS 3.x or 5.x. I think 4.x does not plan to go beyond 4.0.5 anyway, and due to some technical packaging problems it contains quite an old version of kresd.
In case you were interested in “early” update to 5.x, here’s the thread: Turris OS 5.0.0 is released in HBT – but I hope that even the slowest >= 4.x channel will switch to 5.x soon.