Severe packet loss only when pinging using pseudowire(one way) while regular and mpls ping doesn't have packet loss?

Hi, Just want to ask if anyone encountered this issue when pinging using PW/end-to-end vc packet loss exist while using regular or mpls pings there's none?

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Ex.

(ASR1000)R1 --------(hop1)---(hop2)---------R2(ASR1006)

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Checked hop by hop from R1-R2/R2-R1 that there's no congestion or interface error/packet loss, router utilization is low (CPU/Mem).

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Here's the output for reference:

R1#ping mpls pseudowire 2.2.2.2 20 repeat 100

.!...!!.!!!!!...!!.!!...!!!!.!

Success rate is 50 percent (50/100), round-trip min/avg/max = 140/146/224 ms

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R2#ping mpls pseudowire 1.1.1.1 20 repeat 100

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (100/100), round-trip min/avg/max = 140/142/217 ms

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Regular / MPLS Ping from R1:

R1#ping 63.218.188.7

!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 140/140/141 ms

R1#ping mpls ipv4 2.2.2.2/32 repeat 100

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (100/100), round-trip min/avg/max = 140/142/221 ms

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In addition, tried pinging different router but same version as R2 but I'm seeing good results.

R1#ping mpls pseudowire 9.9.9.9 226 repeat 100

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (100/100), round-trip min/avg/max = 169/170/179 ms

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Any idea what to check?

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Thanks