Sprite appears on screen

[djdehaan]

Hi, I use a ESP32 dual core with PSRAM, and have a TFT connected. The screen is build-up via Sprites: I create a sprite in PSRAM, populate it with alle the required details and when ready, paste it on the right spot on the TFT. This to avoid flickering. The Sprite is free'd again after pasting. I use smooth fonts as they are the best :-). Fonts are unloaded after use.

When I split WiFi activity on core 0 and screen activity on Core 1 there is randomly appearing the fonttext (see image) in the top-left corner of the TFT. That is NOT the spot where I put it, and not the final content. It seems the Font generation or something is 'bleeding' to the TFT itself. Writing in the same memory or so. Without splitting activity to Core 0 and 1, this happens much less, but still it happens rarely! Is there any tips on how to stop this bleeding?