diff --git a/gno.land/cmd/gnoland/testdata/issue-1167.txtar b/gno.land/cmd/gnoland/testdata/issue-1167.txtar
new file mode 100644
index 00000000000..a24cca5dce9
--- /dev/null
+++ b/gno.land/cmd/gnoland/testdata/issue-1167.txtar
@@ -0,0 +1,114 @@
+# Reproducible Test for https://github.com/gnolang/gno/issues/1167
+
+gnoland start
+
+# add contract
+gnokey maketx addpkg -pkgdir $WORK -pkgpath gno.land/r/demo/xx -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test test1
+stdout OK!
+
+# execute New
+gnokey maketx call -pkgpath gno.land/r/demo/xx -func New -args X -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test test1
+stdout OK!
+
+# execute Delta for the first time
+gnokey maketx call -pkgpath gno.land/r/demo/xx -func Delta -args X -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test test1
+stdout OK!
+stdout '"1,1,1;" string'
+
+# execute Delta for the second time
+gnokey maketx call -pkgpath gno.land/r/demo/xx -func Delta -args X -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test test1
+stdout OK!
+stdout '1,1,1;2,2,2;" string'
+
+# execute Delta for the third time
+gnokey maketx call -pkgpath gno.land/r/demo/xx -func Delta -args X -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test test1
+stdout OK!
+stdout '1,1,1;2,2,2;3,3,3;" string'
+
+# execute Render
+gnokey maketx call -pkgpath gno.land/r/demo/xx -func Render -args X -gas-fee 1000000ugnot -gas-wanted 2000000 -broadcast -chainid=tendermint_test test1
+stdout OK!
+stdout '1,1,1;2,2,2;3,3,3;" string'
+
+-- gno.mod --
+module gno.land/r/demo/xx
+
+require (
+	gno.land/p/demo/avl v0.0.0-latest
+)
+
+-- realm.gno --
+package xx
+
+import (
+	"strconv"
+
+	"gno.land/p/demo/avl"
+)
+
+type Move struct {
+	N1, N2, N3 byte
+}
+
+type Position struct {
+	Moves []Move
+}
+
+func (p Position) clone() Position {
+	mv := p.Moves
+	return Position{Moves: mv}
+}
+
+func (oldp Position) update() Position {
+	p := oldp.clone()
+
+	counter++
+	// This is a workaround for the wrong behaviour (ie. uncomment this line):
+	// p.Moves = append([]Move{}, p.Moves...)
+	p.Moves = append(p.Moves, Move{counter, counter, counter})
+	return p
+}
+
+type Game struct {
+	Position Position
+}
+
+var games avl.Tree // id -> *Game
+
+var counter byte
+
+func New(s string) string {
+	// Bug shows if Moves has a cap > 0 when initialised.
+	el := &Game{Position: Position{Moves: make([]Move, 0, 2)}}
+	games.Set(s, el)
+	return values(el.Position)
+}
+
+func Delta(s string) string {
+	v, _ := games.Get(s)
+	g, ok := v.(*Game)
+	if !ok {
+		panic("invalid game")
+	}
+	n := g.Position.update()
+	g.Position = n
+	ret := values(n)
+	return ret
+}
+
+func Render(s string) string {
+	v, _ := games.Get(s)
+	g, ok := v.(*Game)
+	if !ok {
+		panic("invalid game")
+	}
+	return values(g.Position)
+}
+
+func values(x Position) string {
+	s := ""
+	for _, val := range x.Moves {
+		s += strconv.Itoa(int(val.N1)) + "," + strconv.Itoa(int(val.N2)) + "," + strconv.Itoa(int(val.N3)) + ";"
+	}
+	return s
+}