leaf-list edit-config is not same to modulechange
You will need to provide more information before I can help you. Were there any instances of acceptance-list-of-ssm stored before the edit-config? What exactly are you printing in the second screenshot?
get --filter-xpath /sync DATA
<data xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
<sync xmlns="urn:o-ran:sync:1.0">
<sync-status>
<sync-state>FREERUN</sync-state>
<frequency-error>0.0</frequency-error>
<supported-reference-types>
<item>PTP</item>
</supported-reference-types>
<supported-reference-types>
<item>SYNCE</item>
</supported-reference-types>
</sync-status>
<sync-capability>
<sync-t-tsc>CLASS_B</sync-t-tsc>
</sync-capability>
<ptp-config>
<domain-number>24</domain-number>
<accepted-clock-classes>
<clock-classes>6</clock-classes>
</accepted-clock-classes>
<accepted-clock-classes>
<clock-classes>7</clock-classes>
</accepted-clock-classes>
<ptp-profile>G_8275_1</ptp-profile>
<delay-asymmetry>0</delay-asymmetry>
<g-8275-1-config>
<multicast-mac-address>FORWARDABLE</multicast-mac-address>
<delay-asymmetry>0</delay-asymmetry>
</g-8275-1-config>
</ptp-config>
<ptp-status>
<reporting-period>10</reporting-period>
<lock-state>UNLOCKED</lock-state>
<clock-class>255</clock-class>
<clock-identity>0x0000000000000800</clock-identity>
<partial-timing-supported>false</partial-timing-supported>
<sources>
<local-port-number>0</local-port-number>
<state>DISABLED</state>
<two-step-flag>true</two-step-flag>
<leap61>false</leap61>
<leap59>false</leap59>
<current-utc-offset-valid>false</current-utc-offset-valid>
<ptp-timescale>true</ptp-timescale>
<time-traceable>true</time-traceable>
<frequency-traceable>true</frequency-traceable>
<source-clock-identity>0x16fffe93608c0001</source-clock-identity>
<source-port-number>128</source-port-number>
<current-utc-offset>37</current-utc-offset>
<priority1>128</priority1>
<clock-class>255</clock-class>
<clock-accuracy>33</clock-accuracy>
<offset-scaled-log-variance>20061</offset-scaled-log-variance>
<priority2>128</priority2>
<grandmaster-clock-identity>0x008016fffe93608c</grandmaster-clock-identity>
<steps-removed>0</steps-removed>
<time-source>32</time-source>
</sources>
</ptp-status>
<synce-config>
<acceptance-list-of-ssm>PRC</acceptance-list-of-ssm>
<acceptance-list-of-ssm>PRS</acceptance-list-of-ssm>
<ssm-timeout>1</ssm-timeout>
</synce-config>
<synce-status>
<lock-state>UNLOCKED</lock-state>
<sources>
<local-port-number>0</local-port-number>
<state>DISABLED</state>
<quality-level>0</quality-level>
</sources>
</synce-status>
</sync>
</data>
before edit-config, get content default acceptance-list-of-ssm leaf-list value is PRC and PRS
Still not really sure what is happening but looking at when netopeer2 v2.1.46 was released, all you may need to do is update all the libraries and the server, it is quite old by now. If that does not help, we can debug this further.