''' Backgroundcolor of text is set in a too wide range when setting it for the first time.
    Problem: Border of first color remains when backgroundcolor is set again.'''

# windows 11
# Python version 3.13.2
# Matplotlib version 3.10.1

import matplotlib.pyplot as plt

fig, ax = plt.subplots(1, 1)
fig.set_dpi(100)

txt   = ax.text(0.1, 0.8, 'There should not be a red border around this text !')

##txt.set(backgroundcolor='none')     # Uncomment this line as workaround to avoid red border
txt.set(backgroundcolor='red')        # Set backgroundcolor for the first time
txt.set(backgroundcolor='none')       # Cannot reset backgroundcolor of text completely, red border remains

plt.show()