Copy in PDF sometimes not available

[freiondrej]

Hello DuckDuckGo!

as I've already mentioned in the macOS browser repo, I've become an avid user of your iOS + macOS browsers in the last few months, moreover I've done several contributions to your amazing Autoconsent project. I have a keen eye for issues, so please brace yourselves for many I'll be reporting 😁 Thank you for what you do! 🥰 (btw I'd recommend filling out an issue template for this repo, with the App version, Steps to reproduce etc 🙏)

# App version
7.149.1

iOS version

18.2

Steps to reproduce the bug

1. Open some PDF file, e.g. https://www.adobe.com/support/products/enterprise/knowledgecenter/media/c4611_sample_explain.pdf
2. Scroll to the last page.
3. Select some part of the text there, e.g. Place the accompanying files in directories consistent with your implementation:
4. The Copy tooltip is not displayed.

Expected behavior

In step 4, the Copy tooltip should be displayed. In fact, there are some parts where the Copy tooltip shows properly, e.g. anywhere on the first page of this example PDF. I wasn't able to pinpoint whether it's the fact that it's the first page (because it seems that from 2nd page forward, the Copy tooltip stops showing - at least in this example file), or if the reason is the PDF structure and there's something that trips the browser up.