rhymes on -ɛi̯ɣən
No I was mistaken about that. I assumed you removed those as well. You did remove aantijgen and opstijgen. They obviously rhyme.
I'm not sure how to respond to this.
tijgen and stijgen are both listed as rhymes. I simply added those two with a prefix.
Why would they not rhyme?
Because the stress is on the prefix. If you don't know Dutch, why are you adding rhymes?
I speak dutch perfectly fine.
I see what went wrong, the rhymes I added don't match the others that are listed in stress.
The rhyme section should have separate lists for verbs that have stress on the suffix and those that don't. Having a list 'with three syllables' confused me probably; it is a bit ambigious because it could refer to both.
How should verbs with initial stress be listed?
The initialness of the stress doesn't matter. What matters is what the word contains from the vowel of the stressed syllable onwards. This is explained on Rhymes:Dutch.