As more complex calculation and check inside ISR are introduced from v1.2.0, there is possibly some crash depending on use-case. You can modify to use larger HW_TIMER_INTERVAL_US, (from current 33.3uS ...
LiquidCrystal Arduino library for I2C LCD displays used for STEM schools. Tested on HD44780 LCD connected to PCF8574 I2C.
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