Stacey 2.3 sometimes makes my cache corrupt by adding a duplicate "up one directory"

[desbest]

Sometimes the cache for my website goes corrupt and I get a website that looks similar to this.

This is because all the paths that say ../ are changed to ../../ by the Stacey's cache.
This happens occassionally but only after weeks or months has passed, so I can't recreate the error. But it's got something to do with how the cache is generated.

The file name in the app/cache folder is called Li9jb250ZW50L3dvcms,

I'm using Stacey 2.3
Is there a fix for this?

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[desbest]

The bug seems to be caused by using an old version of PHP 7.
I don't have the time to debug this, as I have no need to use any older versions. Especially as there is a mysql bug in earlier versions of PHP 7.x which are only fixed in PHP 7.4, for connecting to newer versions of mysql.