Sync for Lemmy

I've been trying to figure out what the culprit is for this, but haven't found anything in the settings. This post, for example, has text that's pretty unreadable because it's forcing a lower resolution on it.

The image that's given is https://lemmy.world/pictrs/image/fac38222-c5e7-448c-83e2-218d54e350eb.jpeg?thumbnail=1500&format=webp, but when you clean up the URL to https://lemmy.world/pictrs/image/fac38222-c5e7-448c-83e2-218d54e350eb.jpeg, it's perfectly legible. In fact, if you choose to share the post link from the nested 3-dot menu on the share option (from the 3-dot on the post), it'll give you the cleaned URL.

I've set it up to use both auto DPI and 400, the highest manual setting here, but it's done nothing. Likewise, the max zoom setting doesn't affect it, and I can't find any way to get it to stop adding extra parameters to the URL. Is there a setting I'm missing, or is this supposed to be intended behavior?