The pencil tool on the Illustrator App for the iPad becomes transparent at any line weight below 1 point.
A workaround that I'm using for now:
I opened up an older document with some pencil tool lettering that I had done before in .25 line weight. I copied one of the objects to my clipboard, then exited the document and went back to Home. I opened up my current artwork pasted it inside. As long as that bit of lettering is that last thing I select/click on, I'm able to go back to the pencil tool and it will open up with the same .25 line weight.
If I switch to the paint tool or do anything else, and then come back to the pencil tool, it again blocks at 1pt minimum and goes transparent at anything less. So when that happens, I again Select my copy/pasted object at .25 pt and when I go back to the pencil tool, it's set to that weight.
I have attached two photos to demonstrate the bug happening.
I found others talking about this same problem:
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Ryan Marsh commented
Is this because you have the unit for the stroke set to pixels rather than points ?
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Joyafair commented
Contacted customer assistance who are investigating. Will update.