Why is an OTG not detected when a micro SD card is already inserted in the device?

I have tried this on both Realme XT running Android 11 and Samsung Galaxy Tab S7+ running Android 12. Whenever there's a micro SD card inserted and I attach a USB drive/SD card from my camera via OTG, it is not detected. But if I remove the micro SD card and try again with the OTG, it is detected. I have realised that a micro SD card and another SD card/usb drive is not detected simultaneously on both my devices. Am I missing something or is this a shortcoming of Android?