*** Bug 163237 has been marked as a duplicate of this bug. ***

Confirmed with duplicate tdf#163237

*** Bug 163241 has been marked as a duplicate of this bug. ***

I could reproduce this too on Linux so concerns all envs.

Strangely, I don't reproduce this on pc Debian x86-64 with LO Debian package 24.8.2.1.
I installed hunspell-it package and it worked.

I gave a try with 24-8 sources updated today and I could reproduce this.
So at least, it corresponds with the bugtracker.
Still don't know I can't reproduce this with LO Debian package except if it's a very recent commit in 24.8.

We definitely need a bibisect here.

Reverting a2bf59878dd76685803ec260e15d875746ad6e25
Make Italian dictionary usable e.g. for Italian (Switzerland)

seems to fix the pb.

Andras: what about this patch?
diff --git a/it_IT/dictionaries.xcu b/it_IT/dictionaries.xcu
index dc3b008..f25002c 100644
--- a/it_IT/dictionaries.xcu
+++ b/it_IT/dictionaries.xcu
@@ -11,7 +11,7 @@
                 <value>DICT_SPELL</value>
             </prop>
             <prop oor:name="Locales" oor:type="oor:string-list">
-                <value>it</value>
+                <value>it-IT it-CH</value>
             </prop>
         </node>
         <node oor:name="HyphDic_it-IT" oor:op="fuse">
@@ -22,7 +22,7 @@
                 <value>DICT_HYPH</value>
             </prop>
             <prop oor:name="Locales" oor:type="oor:string-list">
-                <value>it</value>
+                <value>it-IT it-CH</value>
             </prop>
         </node>
         <node oor:name="ThesDic_it-IT" oor:op="fuse">
@@ -33,7 +33,7 @@
                 <value>DICT_THES</value>
             </prop>
             <prop oor:name="Locales" oor:type="oor:string-list">
-                <value>it</value>
+                <value>it-IT it-CH</value>
             </prop>
         </node>

BTW, I forgot to tell I took a look at Spanish part and here are some relevant parts
1) When it's common between all sublanguages:
    258         <node oor:name="HyphDic_es" oor:op="fuse">
    259             <prop oor:name="Locations" oor:type="oor:string-list">
    260                 <value>%origin%/hyph_es.dic</value>
    261             </prop>
    262             <prop oor:name="Format" oor:type="xs:string">
    263                 <value>DICT_HYPH</value>
    264             </prop>
    265             <prop oor:name="Locales" oor:type="oor:string-list">
    266                 <value>es-AR es-BO es-CL es-CO es-CR es-CU es-DO es-EC es-ES es-GQ es-GT es-HN es-MX es-NI es-PA es-PE es-PH es-PR es-PY es-SV es-US es-UY es-VE</value>
    267             </prop>
    268         </node>

2) When there are some differences between sublanguages,
...
    148         <node oor:name="HunSpellDic_es_NI" oor:op="fuse">
    149             <prop oor:name="Locations" oor:type="oor:string-list">
    150                 <value>%origin%/es_NI.aff %origin%/es_NI.dic</value>
    151             </prop>
    152             <prop oor:name="Format" oor:type="xs:string">
    153                 <value>DICT_SPELL</value>
    154             </prop>
    155             <prop oor:name="Locales" oor:type="oor:string-list">
    156                 <value>es-NI</value>
    157             </prop>
    158         </node>
    159         <node oor:name="HunSpellDic_es_PA" oor:op="fuse">
    160             <prop oor:name="Locations" oor:type="oor:string-list">
    161                 <value>%origin%/es_PA.aff %origin%/es_PA.dic</value>
    162             </prop>
    163             <prop oor:name="Format" oor:type="xs:string">
    164                 <value>DICT_SPELL</value>
    165             </prop>
    166             <prop oor:name="Locales" oor:type="oor:string-list">
    167                 <value>es-PA</value>
    168             </prop>
    169         </node>
...

*** Bug 163080 has been marked as a duplicate of this bug. ***

(In reply to Julien Nabet from comment #7)
> Andras: what about this patch?
If it works for you, please push. Probably I did not test my patch carefully.

https://gerrit.libreoffice.org/c/dictionaries/+/174672

Thank you I am continuing to use the previous version 24.2 I hope the problem will be fixed permanently in the next version.

Julien Nabet committed a patch related to this issue.
It has been pushed to "master":

https://git.libreoffice.org/dictionaries/commit/b871dff9e73eefc187b2c979803c619ceccaed3a

tdf#163231: fix Italian spellchecking

Thank you

Julien Nabet committed a patch related to this issue.
It has been pushed to "libreoffice-24-8":

https://git.libreoffice.org/dictionaries/commit/ed848cfae2c027a8cb960e72cfd3af4b3eab4a7f

tdf#163231: fix Italian spellchecking

*** Bug 163374 has been marked as a duplicate of this bug. ***

*** Bug 163545 has been marked as a duplicate of this bug. ***

*** Bug 163561 has been marked as a duplicate of this bug. ***