There have been warnings since 2021.10 that certain templates, including as_timestamp() and timestamp_custom(), will require defaults. Update you templates with the necessary defaults, or better yet use a cleaner template:
{{today_at(state_attr('sensor.prayer_times','data').timings["Asr"]).strftime("%F %R") }}
{{ now() >= states("sensor.fajr_prayer")|as_datetime|as_local }}