Google Slides – Change Default Font Color on Paste

Every time I paste a text onto a specific document on Google Slides, it changes its font definitions, including color to white, even if the color of the original text and the color of the text area where it's being pasted are black. I know how to change the color after (although it's hard to select it if the background is also white!), I want to know if there is a specific setting to change it by default.

Some details:

1. it works correctly on other documents and it was working ok before for this one; I'm not sure if I pressed a keyboard shortcut accidentally that triggered the issue
2. the issue happens on text copied from the web or even if it's a URL on Google Chrome
3. I've checked that the colors on the "master" are correct
4. This is the resulting "new" format after I paste the text (original is Arial black, 14)