Some base64 causes error to show

[odrobnik]

Describe the bug I found that for a few MCP resources, like mp3 or pdf instead of base64 showing up in the inspector on the blob field, instead a weird error message shows. I believe this to be a regressions, I hadn't noticed that previously.

To Reproduce return the contents of an mp3 file

Expected behavior I expect to see a result like this:

But instead I see this:

The problem appears for files of sizes like 4.2 MB or 5.1 MB. Could it be that your base64 validation cannot handle those sizes?