That’s definitely strange. Probably need to see all your related .conf files to see what’s enabled/disabled.
What’s the error when you set this?
CONFIG_RESET_ON_FATAL_ERROR=n
Using addr2line is helpful in these situations if it spits out a valid address.
I would also probe the I2C SCK/SCL to make sure they’re not loaded down with the addition of that 3rd sensor. You may need to add more pull-ups depending on how much parasitic capacitance is on the lines. Though the peripherals are fairly robust, you never know.
