UI Text letters disapearing in WebGL

Hello, I am having a problem with the texts when building in WebGL.
This is an issue that i previously did not have, and I don't remember what I changed to cause this.
I have some textfields and textinput that are managed dynamicaly, and sometimes some letters are simply invisible. It is strange, as sometimes the previously bugged texts start to appear again (but it is very inconsistent). The bug shows on all the texts in the game. I have already tried several things, to no success :
- Vertical Oferflow set to Truncate
- Update the canvas in a script
- Manually strectch the text objects to be sure it doesn't get too small for the text
- Removed all OnGUI() functions

This issue doesn't appear in the Unity Editor, and its inconsistency makes it hard to troubleshoot.
I do have multiple canvas throughout the scene, if that can help.
Unity version 2019.1.1f1

If you have any idea to help resolve this issue, please don't hesitate to share.

 

Well I wasn't able to properly resolve the problem, but I did find a workaround by using a police set to Unicode. If anyone wants more detail about the reason of this problem, I found a thread that explains where it might come from:
https://answers.unity.com/questions/900663/why-are-my-unity-ui-fonts-rendering-incorrectly.html