Error “InvalidOperationException: Begin can only be called when there is no target set. Did you forget to call End?“ is present when using PostProcessTextVertices()

Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scene.unity” Scene
3. Enter the Play Mode
4. Press the “Spacebar“ key
5. Observe the text roll out
6. Repeat key 4

Expected result: Italic text rolls out
Actual result: Error “InvalidOperationException: Begin can only be called when there is no target set. Did you forget to call End?“ is present

Reproducible with: 6000.3.3f1, 6000.4.0b3, 6000.5.0a4
Could not test with: 6000.0.65f1 (Assets\Scripts\Test.cs(80,51): error CS0426: The type name 'GlyphsEnumerable' does not exist in the type 'TextElement')

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:

• Not reproducible without text rollout
• The label is using JetBrainsMono-Regular SDF, which has JetBrainsMono-Italic SDF assigned to its Italic Typeface. Without this configuration the text rolls out fine