https://github.com/qgis/QGIS/pull/47881
https://github.com/qgis/QGIS/pull/47456
https://github.com/qgis/QGIS/pull/47456/commits/84e574dcc043e03bb1682d1dfc5bd3b9fbf87b3d

From 84e574dcc043e03bb1682d1dfc5bd3b9fbf87b3d Mon Sep 17 00:00:00 2001
From: Bas Couwenberg <sebastic@xs4all.nl>
Date: Fri, 18 Mar 2022 18:04:01 +0100
Subject: [PATCH] Also install scripts for GRASS 8.

--- a/src/plugins/grass/scripts/CMakeLists.txt
+++ b/src/plugins/grass/scripts/CMakeLists.txt
@@ -1,4 +1,4 @@
-if (GRASS_NUM_VERSION6 GREATER 60300 OR GRASS_NUM_VERSION7 GREATER 60300)
+if (GRASS_NUM_VERSION6 GREATER 60300 OR GRASS_NUM_VERSION7 GREATER 60300 OR GRASS_NUM_VERSION8 GREATER 60300)
 file (GLOB MODULE_FILES *.py )
 install (FILES ${MODULE_FILES}
          DESTINATION ${QGIS_DATA_DIR}/grass/scripts