I find it!!!
!!!If you join unrealengine’s Github!!!
https://github.com/EpicGames/UnrealEngine/commit/ed97f0f865b7dce3c43bb15c2d7f86974eaafd75#diff-984b1fd9bd2159102721f49c0fd8fbfb8a8d1cfc8075b79e8bcf9802581b2f5b
https://github.com/EpicGames/UnrealEngine/commit/0872cfbd11a73fe44a0e268eb46cfef4d61cda92#diff-984b1fd9bd2159102721f49c0fd8fbfb8a8d1cfc8075b79e8bcf9802581b2f5b
https://github.com/EpicGames/UnrealEngine/commit/dc7a584238fe265eac323fd8b74806f821fcd7f9#diff-984b1fd9bd2159102721f49c0fd8fbfb8a8d1cfc8075b79e8bcf9802581b2f5b
PS:4.27 has solved it.