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According to this last year's LM-4C failure was due to "improper welding of 3rd stage engine components", which was not found pre-launch. It mentioned 3rd stage engine parts welding specifications and parameters have been revised, engines inspected & have since flown 5 times.
The failure reason for the April LM-3B was not explicitly mentioned, but it's apparently due to stage separation retro-fire rocket ignitor failure (must have been during 2nd-3rd stage separation per official reports). Ignitors were re-checked & doubled in number on other rockets.
I expect the LM-3B one to be confirmed by the Indonesian customer or their insurers later. One would also wonder if this also caused the LM-7A failure in March since people seems to be thinking of stage separation problems. 
Source: http://www.mof.gov.cn/xinxi/zhongyangbiaoxun/gengzhenggonggao/202006/t20200609_3529046.htm …
Nit on LM-3B failure: some reports earlier indicate that one of the 3rd stage engines failed. Maybe the ignitor is inside one of the 3rd stage engines instead - that page isn't explicit on this.
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