启动时,在 nacos 导入位置中未指定偏好设置,因此打印了错误日志"非法偏好值:"

NacosConfigDataLocationResolver#loadConfigDataResources normalizes an absent preference to "":

NacosConfigDataLoader#loadConfigData expects an empty preference to be represented by null: NacosConfigDataLoader#loadConfigData expects an empty preference to be represented by null:

This is the root cause of the bug.