Problem with Thai text disappearing in Fill & Sign function

Hi,

I’m facing an issue with Acrobat Reader and left a review on the App Store. The developer suggested I escalate the issue here in the community.

I am experiencing a bug in Acrobat Reader on both my iPhone and iPad (though I mainly use the app on my iPad).

When using the Fill & Sign feature, any text I enter completely disappears if it contains Thai characters. This happens whether I type Thai text alone, combine Thai with English, or combine Thai with numbers. On the other hand, it works perfectly fine when typing in English only.

I have attached two screen recordings to demonstrate:

1 Video 1: Showing the Fill & Sign function, where the Thai text consistently disappears.

2 Video 2: Showing a different text insertion tool where the Thai text does not disappear.

I am currently using this second method as a temporary workaround, but frankly, it is much less convenient than using Fill & Sign.

Device Details:

iPad: iPad Pro (11-inch) (3rd generation) running iPadOS 26.5

iPhone: iPhone 16 Pro running iOS 26.5

Hope this bug can be resolved!

Thanks in advance.

Due