Describe the bug
The editor is crashing when opening a post that has a custom font size set in a paragraph.

To Reproduce
Steps to reproduce the behavior:

1. On the web, create a simple post with a single paragraph block and set its "Font Size" in the Typography section (see screenshot)
2. Save the post as draft or publish it
3. Go to the WPAndroid and open the post
4. 💥

Expected behavior
The app should not crash.

Screenshots

Smartphone (please complete the following information):

• Device: Pixel 2XL
• OS: Android 11
• WPAndroid Version 16.4-rc-3, 16.3, 15.9.1 (at least, probably happening on more versions too)

Additional context

• Doesn't seem to happen for me on WPiOS v16.3
• Sentry report: https://sentry.io/share/issue/0244926c0adf4aeda025bc36bae98d3e/ although Sentry conflates this with similar crash reports.