Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
In Strategy 2021 Update 5, it is observed Report with Action Type ‘Execute with Cube Cache hit’ shows 0 Execution Time as shown below in Platform Analytics Dossier:

This is working as designed in Strategy 2021.
The execution_time from access_transactions table with Action Type ‘Execute with Cube Cache hit’ (action_type_id-317) is calculated from source topic file as below:
Execution Time = EXECFINISHTIME - REQUESTQUEUETIME - PROMPTANSTIME
Check in Kafka Topic file Mstr.PlatformAnalytics.IsReportStats, and extract below statistics.
"EXECFINISHTIME":1"REQUESTQUEUETIME":1"PROMPTANSTIME":0
It is an expected behavior and there is no action needed in Strategy side.
Third Party Software Installation WARNING
The third-party product(s) discussed in this technical note is manufactured by vendors independent of Strategy. Strategy makes no warranty, express, implied or otherwise, regarding this product, including its performance or reliability.