How to reproduce:
1. Open the “IN_78806” project
2. In the Build Settings make sure the WebGL platform is selected
3. Press Build And Run
4. Host build on the local host (I used XAMPP)
5. On the Mobile device browser access the hosted WebGL build
6. In the WebGL Player press “Play”
7. Observe the Player

(Note from [~nicola.cerone] : If the bug does not show, repeat close the list with the "x" and repeat steps 6/7, I had the issue the second time I pressed play on the device (Samsung Galaxy S23).

(Note from [~nicola.cerone]: To reproduce the issue with the editor you have to increase the transition time from 2 seconds to 20 seconds in the .visible class of the uss files).

Expected results: Buttons with orange borders appear in the pop-up menu
Actual results: The pop-up menu appears but there are no buttons

Reproducible with: 2022.3.21f1, 2022.3.35f1, 6000.0.9f1
Not reproducible with: 2021.3.40f1, 2022.3.20f1

Testing environment: Windows 10 Pro, Windows 11
Not reproducible on: No other environment tested

Reproducible on these devices:
VLNQA00531, Oneplus OnePlus 11 5G (CPH2449), Android 13, CPU: Snapdragon 8 Gen 2 (SM8550), GPU: Adreno (TM) 740
VLNQA00611, Samsung Galaxy S24 Ultra (SM-S928B), Android 14, CPU: Qualcomm SM8650-AB Snapdragon 8 Gen 3, GPU: Adreno (TM) 750

Not reproducible on these devices:
VLNQA00321, Xiaomi MI 9 (MI 9), Android 10, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00120, Google Pixel 2 (Pixel 2), Android 8.1.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00267, Samsung Galaxy S10+ (SM-G975F), Android 12, CPU: Exynos 9 (9820), GPU: Mali-G76
VLNQA00470, Samsung Galaxy S8 (SM-G950F), Android 8.0.0, CPU: Exynos 9 Octa 8895, GPU: Mali-G71

Notes:
- Also reproducible on the Editor, but reproduction is inconsistent and rear
- Hosting WebGL build and accessing through mobile provides consistent issue reproduction