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I tried with UFS + VHDX Fixed size on a fresh install of 25.1.4 with my conf imported.
(someone from pfsense community thinks it was related to ZFS here https://forum.netgate.com/topic/190927/pfsense-2-7-2-in-hyper-v-freezing-with-no-crash-report-after-reboot/29)
The issue is still there.

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root@proxy01:~ # top -aHSTn
last pid: 42090;  load averages:  3.50,  1.88,  0.94  up 0+14:51:36    12:33:11
252 threads:   13 running, 226 sleeping, 13 waiting
CPU:  1.5% user,  0.0% nice,  0.4% system,  0.0% interrupt, 98.1% idle
Mem: 135M Active, 1875M Inact, 1813M Wired, 1100M Buf, 7823M Free
Swap: 8192M Total, 8192M Free

   THR USERNAME    PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
100004 root        187 ki31     0B   128K RUN      1 872:01 100.00% [idle{idle: cpu1}]
100009 root        187 ki31     0B   128K CPU6     6 871:57 100.00% [idle{idle: cpu6}]
100003 root        187 ki31     0B   128K CPU0     0 871:36 100.00% [idle{idle: cpu0}]
100007 root        187 ki31     0B   128K CPU4     4 871:35 100.00% [idle{idle: cpu4}]
100005 root        187 ki31     0B   128K CPU2     2 871:33 100.00% [idle{idle: cpu2}]
100116 root        -64    -     0B  1472K CPU7     7   4:51 100.00% [kernel{hvevent7}]
100008 root        187 ki31     0B   128K RUN      5 871:22  98.97% [idle{idle: cpu5}]
100006 root        187 ki31     0B   128K CPU3     3 871:28  96.97% [idle{idle: cpu3}]
101332 www          21    0   537M    59M kqread   2  11:31   3.96% /usr/local/sbin/haproxy -q -f /usr/local/etc/haproxy.conf -p /var/run/haproxy.pid{haproxy}
100902 www          21    0   537M    59M kqread   4  12:29   1.95% /usr/local/sbin/haproxy -q -f /usr/local/etc/haproxy.conf -p /var/run/haproxy.pid{haproxy}
101333 www          23    0   537M    59M kqread   5  11:17   1.95% /usr/local/sbin/haproxy -q -f /usr/local/etc/haproxy.conf -p /var/run/haproxy.pid{haproxy}
101334 www          21    0   537M    59M CPU1     1  10:57   1.95% /usr/local/sbin/haproxy -q -f /usr/local/etc/haproxy.conf -p /var/run/haproxy.pid{haproxy}
100010 root        187 ki31     0B   128K RUN      7 867:24   0.00% [idle{idle: cpu7}]
100805 root         20    0    81M    52M nanslp   5   3:09   0.00% /usr/local/bin/php /usr/local/opnsense/scripts/routes/gateway_watcher.php interface routes alarm
100102 root        -64    -     0B  1472K -        0   1:14   0.00% [kernel{hvevent0}]
100104 root        -64    -     0B  1472K -        1   0:59   0.00% [kernel{hvevent1}]
100114 root        -64    -     0B  1472K -        6   0:56   0.00% [kernel{hvevent6}]
100106 root        -64    -     0B  1472K -        2   0:56   0.00% [kernel{hvevent2}]

root@proxy01:~ # kldstat | grep zfs
root@proxy01:~ # top | grep arc

As you can see hvevent7 is at 100%, no arc thing on top command and no zfs module loaded

Were you able to figure out how to fix the issue? I am having the same exact problem with OPNsense 26.1 (FreeBSD 14) running on Hyper-V and it just recently started happening when I upgraded to OPNsense 26.1 from 25.x.  Never had this issue on 25.x.