Alternative to ttsu reader that is compatible with Migaku

Hi! I'm having a very annoying issue: when using Migaku with ttsu reader, the bookmarks constantly get lost, which means that I spend about 5 minutes everyday just looking for the spot where I left off the day before.

I tried everything to circumvent this issue: I noted down the sentence at which I stopped reading and tried to find it using CTRL+F (to no avail, as CTRL+F doesn't work with Migaku); I used an extension to highlight this sentence (again, does not work, since Migaku keeps 'erasing' the highlighted segments); etc...

Am I the only person running into this problem? Are there any alternatives, or at least, solutions I could try to find my bookmarks despite using Migaku?

:(