Tracy causes memory exhaust when used in template creating JSON for AJAX output

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I'm getting the following error, breaking the JSON output of a template (named json.php) i've built to answer a getJSON() JS call and output JSON to feed a popup:

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 83906560 bytes) in /server_path_to_my_root_folder/site/modules/TracyDebugger/includes/TD.php on line 115

As I'm using tracy heavily in templates delivering HTML and JSON as well for a long time now, I'm suspicious this occurs since a recent update to version 5.0.37 and stays throwing errors with version 5.0.38.

While looking around, I found this error message in tracy's exceptions tab:

Warning: file_get_contents(/server_path_to_my_root_folder/site/modules/TracyDebugger/tracy-2.11.x/src/Tracy/BlueScreen/../assets/reset.css): Failed to open stream: No such file or directory in /server_path_to_my_root_folder/site/assets/cache/FileCompiler/site/modules/TracyDebugger/tracy-2.11.x/src/Tracy/BlueScreen/BlueScreen.php on line 182

the exhaust error breaks the JSON structure and the popup is waiting for the template's return forever.

When I delete all bd() calls from json.php everything works fine and the return of it comes back fast (I don't work locally, but already on a production-identical webspace).

As soon as I'm inserting a single minimal bd() call, the template out is broken by tracy with the error message above.

When using tracy on "normal" page templates with HTML output i don't see any errors.

Any ideas where to turn some screws to get rid of this error?