Map is not redrawn on zoom using Openlayers ^6.13.0

[dylankelly]

See https://digital-engagement.atlassian.net/browse/SRM-336 for context.

When the map at https://www.coronavirus.vic.gov.au/where-get-tested-covid-19 was updated to use ol@6.13.0 an issue was introduced when changing the zoom level.

Steps to recreate as below

• Make sure Openlayers is updated to at least ol@6.13.0 (also tested and failing with 6.14.0)
• Set screen resolution to 393px wide
• Change zoom level using plus / minus zoom buttons

Result:

Map fails to redraw icons

Note: I'm unsure if this something unique to the coronavirus map or if part of dpc-sdp/myvic-map-core