[Calendar] Wrong background color when the first day of the month is weekend day

[lygamac]

As title stated. Expected behavior:

First day of the month as weekend day:

I'm pretty sure there's something wrong in line ~160, but I haven't found anything suspicious.

local default_bg = (weekday == 0 or weekday == 6)
    and calendar_themes[theme].weekend_day_bg
    or calendar_themes[theme].bg

The behavior can be reproduced if, for example, changing to weekday == 2, then every month starting with Wednesday will have wrong color.

[xfzv]

Similar issue here but I cannot figure a pattern to reproduce (see May and February/March/June):

Edit: it seems completely random for me, April now has light grey background:

[xfzv]

Solved by recent commits on my end. 👍