vm.memory.size[available] reports 0 value occasionally

4189:20230108:123943.002 In zbx_kstat_collect()
  4189:20230108:123943.002 vm_index: 0, freemem: 389276309846273, updates: 1673177983
  4189:20230108:123943.002 End of zbx_kstat_collect()
  4189:20230108:123943.002 zbx_setproctitle() title:'collector [idle 1 sec]'
.......
  4189:20230108:123944.002 In update_cpustats()
  4189:20230108:123944.002 End of update_cpustats()
  4189:20230108:123944.002 In zbx_kstat_collect()
  4189:20230108:123944.002 vm_index: 1, freemem: 389276309846273, updates: 1673177984
  4189:20230108:123944.002 End of zbx_kstat_collect()
.....
4193:20230108:123944.958 End of zbx_kstat_get_freemem()
  4193:20230108:123944.958 End of VM_MEMORY_AVAILABLE():SUCCEED
  4193:20230108:123944.958 End of VM_MEMORY_SIZE():SUCCEED
  4193:20230108:123944.958 for key [vm.memory.size[available]] received value [0]
  4193:20230108:123944.958 In process_value() key:'ML3SOLGZ05:vm.memory.size[available]' lastlogsize:null value:'0'
  4193:20230108:123944.958 In send_buffer() host:'10.40.2.44' port:10051 entries:14/100
  4193:20230108:123944.958 send_buffer() now:1673177984 lastsent:1673177984 now-lastsent:0 BufferSend:5; will not send now
  4193:20230108:123944.958 End of send_buffer():SUCCEED
  4193:20230108:123944.958 buffer: new element 14
  4193:20230108:123944.958 End of process_value():SUCCEED
  4193:20230108:123944.959 In need_meta_update() key:vm.memory.size[available]
  4193:20230108:123944.959 End of need_meta_update():FAIL
  4193:20230108:123944.959 In send_buffer() host:'10.40.2.44' port:10051 entries:15/100
  4193:20230108:123944.959 send_buffer() now:1673177984 lastsent:1673177984 now-lastsent:0 BufferSend:5; will not send now
......
4189:20230108:123945.003 vm_index: 0, freemem: 389276405393773, updates: 1673177985
  4189:20230108:123945.003 End of zbx_kstat_collect()
..............
  4189:20230108:123946.003 zbx_setproctitle() title:'collector [processing data]'
  4189:20230108:123946.003 In update_cpustats()
  4189:20230108:123946.003 End of update_cpustats()
  4189:20230108:123946.003 In zbx_kstat_collect()
  4189:20230108:123946.003 vm_index: 1, freemem: 389276500941273, updates: 1673177986
  4189:20230108:123946.003 End of zbx_kstat_collect()