Custom Unicode fonts render correctly in Chrome but not Firefox

Hi everyone, I'm working on a website that generates and displays Unicode-based stylish text. Everything works as expected in Chrome and Edge, but some generated text doesn't render correctly in Firefox. In a few cases, the characters appear differently or fall back to a default-looking font. I've already cleared the cache and tested with Firefox in Troubleshoot Mode, but the issue still persists. Is this a known Firefox rendering limitation with certain Unicode characters, or is there something I should check on my end? Are there any recommended practices for improving font compatibility across browsers? Any advice would be appreciated. Thanks!