Broken Cyrillic symbols support in TextInput with custom fonts. RN 0.62[iOS]

[seniv]

Description

In iOS, when I type any Cyrillic letter in TextInput with custom font family that doesn't have Cyrillic symbols support then text in input starts flickering(see gif below).
At every odd symbol in TextInput, all Cyrillic symbols just disappear

This issue appears in 0.62. On version 0.61 and below it works fine

React Native version:

 OS: macOS 10.15.4
 CPU: (8) x64 Intel(R) Core(TM) i5-8279U CPU @ 2.40GHz
 Memory: 42.68 MB / 8.00 GB
 Shell: 5.7.1 - /bin/zsh
 Binaries:
 Node: 10.17.0 - ~/.nvm/versions/node/v10.17.0/bin/node
 Yarn: 1.19.2 - /usr/local/bin/yarn
 npm: 6.11.3 - ~/.nvm/versions/node/v10.17.0/bin/npm
 Watchman: 4.9.0 - /usr/local/bin/watchman
 Managers:
 CocoaPods: 1.8.4 - /usr/local/bin/pod
 SDKs:
 iOS SDK:
 Platforms: iOS 13.4, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
 Android SDK: Not Found
 IDEs:
 Android Studio: 3.5 AI-191.8026.42.35.5977832
 Xcode: 11.4/11E146 - /usr/bin/xcodebuild
 Languages:
 Java: 11.0.5 - /usr/bin/javac
 Python: 2.7.16 - /usr/bin/python
 npmPackages:
 @react-native-community/cli: Not Found
 react: 16.11.0 => 16.11.0
 react-native: 0.62.2 => 0.62.2
 npmGlobalPackages:
 *react-native*: Not Found

Steps To Reproduce

Provide a detailed list of steps that reproduce the issue.

1. Init RN 0.62.* project npx react-native init AwesomeProject
2. link some font that doesn't support Cyrillic symbols
3. Use that font in TextInput
4. Write any Cyrillic text in the input

Expected Results

A font that doesn't support Cyrillic shouldn't flicker in TextInput, as it was in RN 0.61 and below

Snack, code example, screenshot, or link to a repository:

You can try these fonts from my example:
Modak
Pacifico

<Text style={styles.footer}>Modak: Doesnt support cyrillic</Text>
<TextInput style={{fontFamily: 'Modak'}} placeholder="Modak Font" />
<Text style={styles.footer}>Pacifico: Support cyrillic</Text>
<TextInput style={{fontFamily: 'Pacifico'}} placeholder="Pacifico Font" />

[MarharytaZahalets]

I have the same issue

[davx1992]

Hi also having the same issue. Interesting thing is that when I set multiline then it works without flickering.

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as a "Discussion" or add it to the "Backlog" and I will leave it open. Thank you for your contributions.

[github-actions]

This issue was closed because it has been stalled for 7 days with no activity.

[fabOnReact]

I wanted to ask if you still experience this issue.
I'm planning to do 1-2 months of opensource and I'm preparing a list of tasks.

I have been contributing to facebook/react-native for 4 years and I specialize on the Text/TextInput components.

Thanks a lot