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Your central device needs to request MTU change. If you think you have it implemented in your app, you can test it with nRF connect for example. Connect to esp32 and there is option to change mtu, upper right corner. What is very strange its truncate to 19. Minimum mtu value is 23 and notify/indicate needs 3 bytes for OP code, so it should truncate to 20 bytes in worst case.
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