Weird phonotactics in you conlangs?

Did your conlang contain unsual phonotactics. I didn't talk about weird absurd phonemes but I talk about contrast that your conlangs do that contrast to natural tendency of natlang.

My one I want to present aren't conlang but my nativlang. It contrast vowel length. Yeah... Yeah... nothing weird... right? In some language might contrast both short and long vowel in all environment, or contrast it only in stressed syllable (as unstressed syllable always be short vowel), or contrast it only in open syllable and no long vowel exist in closed syllable (to prevent syllable with 3 morae to exist)

My nativlang aren't one of above as it contrast vowel length only in closed syllable. While in open unreduced syllable always be long vowel. (As reduced syllable can be only /(C)a/ but it have other term called minor syllable.) But closed syllable that end with glottal stop always be short vowel. (Although in our school we being taught that it's short vowel with null coda while phonetically isn't, just to make system look symmetric)

note: It also post problem for me to distinguish word from foreign langiuage that contrast vowel length in open syllable. Yes every single language that contast vowel length post problem for me despite my nativelang have vowel length contast becuase all other contast it in open syllable too.

Let's talk below!