Both in iOS app and on web, when I complete an activity and go to the Map view and enable the personal heat map, the most recent activity doesn’t show up until I TOGGLE the “show private activities” setting for the Personal Heatmap layer. If it was off I have to turn it on, if it was on I have to turn it off. This is notwithstanding that the activities I am recording are public and this setting shouldn’t affect it, and that disabling “Show private activities” should never cause activities to appear on the heatmap. Just toggling the heatmap on and off doesn’t show it. Switching the map on and off doesn’t show it. Only toggling the “show private activities” option will immediately show the most recent activity on the personal heat map. If I toggle it back to the old setting it disappears.
The personal heatmap is the main thing that’s kept me subscribed to Strava so it’s frustrating to still find it glitchy when there are free alternatives available.
As an additional detail, these activities are synced to Strava via Garmin, originally synced to the Garmin iOS app.