Problem with Show files in sub folder

[obelisk]

I have a custom filter set which is working properly in the normal browser
When I do show files in subfolder they filter no longer works the same way
It still filters the file extensions properly but files which have no extension at all are all shown as well
So for example I have a file called lock And it's an empty file but it shows now

[xnview]

you use Filter>Custom?

[obelisk]

That is correct the custom filter is working fine except it also lets through everything with no extension yesterday

[xnview]

??

[obelisk]

The filter only works in normal browser mode and not when view all in sub folder is selected

[xnview]

how to reproduce?

[obelisk]

press show files in subfolder
https://imgur.com/a/VODULQw