There was outdated Che-Theia 7.19.2 in CRW 2.5.0.ER-10-19 based on Eclipse Che 7.20.0:

Whereas there was correct theia-rhel8 image address in operator bundle:

- name: RELATED_IMAGE_codeready_workspaces_theia
                        value: >-
                          registry.redhat.io/codeready-workspaces/theia-rhel8@sha256:060e7c9f9fc90887c0d05ad321cd2597fb0c3bad115f3ec783b1f6630efbf5ee

The possible reason: outdated latest image quay.io/crw/pluginbroker-metadata-rhel8:2.5-3, which doesn't include quay.io/crw/theia-endpoint-rhel8:2.5-4 > quay.io/crw/theia-rhel8:2.5-5 with Che-Theia 7.20.0.