Google Sheets Filter: OR not working on match functions

Question

I have been working with the filter function in google sheets for a few months now and really like them, they're very powerful. Now recently, I wanted to try using the match function inside the filter function to find intersects between lists.

This I'm having some trouble with though, below is part of a filter function I'm trying to make but it doesn't seem to be working. Separately the match functions work fine in the filter but strung together with an OR (+) it doesn't work. It only returns the first match's results if that row's value also has true in the C column.

This might not be super clear, but maybe some of you have seen this before.

Here is an Example Sheet

=FILTER($C$6:$E,
  (
    MATCH($C$6:$C, FILTER('Other Tab'!$A$3:$A, 'Other Tab'!$B$3:$B), false) +
    MATCH($C$6:$C, FILTER('Other Tab'!$A$3:$A, 'Other Tab'!$C$3:$C), false)
  )
)

I tried stripping away most of the filter function except for the troubling part (the example I posted above).

I tried putting the other match first.

I tried mixing the match functions with other conditions and this combination is the only one giving me so much trouble.