RichTextField: missing or wrong icons

TESTSYSTEM
CMS: https://demoauthor.magnolia-cms.com/.magnolia/admincentral#shell:applauncher:;

Magnolia Version: 5.5.3

BRANCH:
[ STR-CHK: "RCM-1213-3" on QA ] BE:1.14.0-RCM-1213-2495-efd1520 FE: 3.8.0-rc4
[ REL-CHK: "" on QA] BE: FE:

CURRENT:
Magnolia 5.5.3 Issue: In the Text and Image Component (RichTextField) some icons are missing OR wrong.

Seen on Demo Magnolia: https://demoauthor.magnolia-cms.com/.magnolia/admincentral;
1) Missing icon: Insert from Word
Seen on Roche QA: https://roche.qa.aperto.de/author/.magnolia/admincentral
1) Missing icon: Insert from Word
2) Missing icon: Right-aligned
3) Missing icon: Left-aligned
4) Missing icon: Centered
5) Missing icon: Justify
6) Worng icon: Templates (<-- "Vorlagen") has the Anchor-Icon
7) Worng icon: Text-Color has the Decrease Indent-Icon

Reproduction:
1. Open magnolia admin central
2. go to Pages App
3. create a pages (Wide Template)
4. add Text & Image Component
*Result: see above.

EXPECTED:
There are missing or wrong icons in the RichText Editor.

DEMO MAGNOLIA CURRENT	DEMO MAGNOLIA EXPECTED

ROCHE QA CURRENT	ROCHE QA EXPECTED