Ah, I have an idea of what it might be. Change your downloaded dir name from "i2c_t3-master" to "i2c_t3". Teensyduino ships with i2c_t3 by default, so it will pick that one first unless you have one in libraries (like...
There seems to be some conversions between signed and unsigned types going on. Try first working exclusively with unsigned types, and avoid int if possible. The original Arduino Wire lib annoyingly uses int, which is...
Increasing the buffer sizes should work. 258 bytes sounds correct for the default buffer size, as 1st byte is used for slave address. Are you using size_t as your index? If you use uint8_t as a count (perhaps...
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