Auto seedling stem split at day 6

I've never encountered this, and wondering how common it is and what may have caused it? I'm hoping it doesn't cause any setbacks. It doesn't seem sickly otherwise. Just split.

VPD has been good. Temps 73-78F during the day, 67-70 at night. 65-70% humidity. I could probably bump that down now. The other seedling is a photo and nothing wrong with it.

It's growing away fine i doubt you'll have any problems with it.

Star Dog said:

It's growing away fine i doubt you'll have any problems with it.

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I know bigger branches can heal if practically snapped in half. First time I've seen a seedling do this. Still seems ok today luckily.