Steps to Reproduce

The cursor often is stuck at the beginning of the TextField when first typing some emojis

Repro:

Open any flutter TextField
Type emoji characters, preferably ones with zero-width-joiners such as 👩‍🚀
Cursor is stuck at front, and tapping in the text works (new text shows up correctly, backspacing works) but the cursor does not appear in the right spot.

this is familiar with the issue #24266 but not the same at all, such as he says the nation flags will cause this problem, but i can't reproduce it.

I have tried many emojis to reproduce, and I found that these emojis would cause the problem,and I printed out the code units to look for the law.

👩‍🚀,[55357, 56425, 8205, 55357, 56960] runes:3,length:5

👩‍❤️‍💋‍👩,[55357, 56425, 8205, 10084, 65039, 8205, 55357, 56459, 8205, 55357, 56425] runes:8,length:11

👨‍👩‍👦‍👦,[55357, 56424, 8205, 55357, 56425, 8205, 55357, 56422, 8205, 55357, 56422] runes:7,length:11
👨🏾‍🤝‍👨🏻,[55357, 56424, 55356, 57342, 8205, 55358, 56605, 8205, 55357, 56424, 55356, 57339] runes:7,length:12

👨‍👦,[55357, 56424, 8205, 55357, 56422] runes:3,length:5

👩‍👦,[55357, 56425, 8205, 55357, 56422] runes:3,length:5

it seems that the emojis which make use of zero width joiners,(code 8205),will easily cause the problem,but not all. I also found that these emojis wont cause the problem,such as:

👩‍❤️‍👨,[55357, 56425, 8205, 10084, 65039, 8205, 55357, 56424] runes:6,length:8
🏌🏿‍♀️,[55356, 57292, 55356, 57343, 8205, 9792, 65039] runes:5,length:7
🏊‍♀️,[55356, 57290, 8205, 9792, 65039] runes:4,length:5
🏄🏻‍♂️,[55356, 57284, 55356, 57339, 8205, 9794, 65039] runes:5,length:7
🇨🇳,[55356, 56808, 55356, 56819] runes:2,length:4

so, what kind of emojis will cause it and why these problem occurs？
Expected results:
expect the cursor can stay at the correct position.
Actual results: